With the help of Google Atlanta, I started producing, moderating and hosting Hangouts on Air at Zoo Atlanta. Here's the full list of Hangouts I've produced in conjunction with Zoo Atlanta at http://goo.gl/6lHNup.
We've been able to partner up with other organizations from National Geographic, Wildlife Conservation Society, Children's Healthcare of Atlanta, Google, Phoenix Zoo, Minnesota Zoo and the Animalist.
Find out more about the resources and watch the videos at zooatlanta.org/hangouts.
I've participated in Hangout reference/help broadcasts, from a Google for Non Profit Hangout to conference presentations: http://goo.gl/8muWda.